Ondrick, C.W., and G.S. Srivastava. “CORFAN—FORTRAN IV Computer Program for Correlation, Factor Analysis (R- and Q-Mode) and Varimax Rotation”. Bulletin (Kansas Geological Survey) (January 1, 1970): 1–92. Accessed January 3, 2026. https://journals.ku.edu/kgsbulletin/article/view/23464.